Which value is within the normal neonatal Hb range?

Which value is within the normal neonatal Hb range?

• A. 11-13 g/dL
• B. 15-20 g/dL
• C. 10-15 g/dL
• D. 12.7-18.6 g/dL

Answer: (D)

Newborns normally carry more hemoglobin than older individuals because they have fetal hemoglobin (HbF), which binds oxygen more readily. Right after birth, many healthy term infants have Hb values in the mid-teens to upper teens, and there is natural variation in how high or low they are during the first days and weeks. The physiologic decline of Hb begins over the next several weeks as HbF decreases and plasma volume expands, so values drift downward toward the lower end of the neonatal range. The range around 12.7 to 18.6 g/dL reflects the typical variability seen in healthy neonates during this period, and values below about 12 g/dL can indicate anemia while values well above 18–19 g/dL may point to polycythemia or dehydration. Thus 12.7–18.6 g/dL sits within the accepted normal neonatal Hb window.

Newborns normally carry more hemoglobin than older individuals because they have fetal hemoglobin (HbF), which binds oxygen more readily. Right after birth, many healthy term infants have Hb values in the mid-teens to upper teens, and there is natural variation in how high or low they are during the first days and weeks. The physiologic decline of Hb begins over the next several weeks as HbF decreases and plasma volume expands, so values drift downward toward the lower end of the neonatal range. The range around 12.7 to 18.6 g/dL reflects the typical variability seen in healthy neonates during this period, and values below about 12 g/dL can indicate anemia while values well above 18–19 g/dL may point to polycythemia or dehydration. Thus 12.7–18.6 g/dL sits within the accepted normal neonatal Hb window.